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A disc with radius, R, rotates (at an angular speed of ?) near a surface that is fixed. The space between the disc and surface is filled with a fluid that has viscosity, µ. The distance between the disc and surface is h. Find the dependence between the torque, T, on the disc and the other variables in terms of dimensionless PI groups?
a 35g bullet b is fired with a velocity of 400 ms into the side of a 3kg square panel suspended in air from a pin at
a conveyor belt runs on 3 in. drums that are driven by a motor. if it takes 6 seconds for the belt to go from zero to
Find the maximum shear stress in a 5 1/2 in-diameter circular saw blade if it runs idle at 5000 rev/min. The saw is 14 guage(0.0747 in) steel and is used on a 5/8 in-diameter. The thickness is uniform. What is the maximum radial component of stress?
A piston cylinder holds air at 80 F and 15 psi. During an adiabatic process the pressure is increased to 165 psi and the entropy generated is 0.15 BTU/lb-R. Determine the isentropic efficiency for this process.
a simple turbojet is operating with a compressor pressure ratio of 8.0 a turbine inlet temperature of 1200 k and a mass
a heat pump uses r-134a as the working fluid and operates on an ideal vapor-compression cycle. the condenser pressure
Given values of the diffusion coefficient for carbon in iron at 850°C and 950°C, we can calculate the activation energy for the diffusion of carbon in iron. the activation energy for vacancy migration in copper, we can calculate the activation energy..
a thin 30 cm x 30 cm flat plate is pulled at 3 ms horizontally through a 3.6 mm think oil layer sandwiched between two
two wooden members of 80 times 120-mm uniform rectangular cross section are joined by the simple glued scarf splice
Clearly establish whether the ATMOS can justifiably be called a perpetual motion machine, closely approximates one, or only appears to be one. Prepare a memorandum summarizing your findings - evaluate the inventor's claims.
what is the human development index? suppose the world population in year 2100 will be 9 billion people. assume the
A power cycle operates between a reservoir at temperature TH and a lower-temperature reservoir at 280 K. At steady state, the cycle develops 40 kW of power while rejecting 1000 kJ/min of energy by heat transfer to the cold reservoir. Determine the mi..
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